Checking Errors

Advanced methods and approaches for solving Sudoku puzzles

Checking Errors

Postby eejje » Thu Aug 11, 2005 11:47 am

Am I correct that a single number could not appear in the upper left corner of more than one box (or in the middle square of more than one box, ext.)? If this is true, this will help me a lot in back-tracking when I encounter a block.

Thanks!
eejje
 
Posts: 1
Joined: 11 August 2005

Re: Checking Errors

Postby Wolfgang » Thu Aug 11, 2005 11:57 am

eejje wrote:Am I correct that a single number could not appear in the upper left corner of more than one box ..

No, if sg like this is, what you mean (thats possible):
Code: Select all
 1  .  . | .  .  . | .  .  .
 .  .  . | .  1  . | .  .  .
 .  .  . | .  .  . | .  .  1
---------+---------+---------
 .  .  . | 1  .  . | .  .  .
 .  1  . | .  .  . | .  .  .
 .  .  . | .  .  . | .  1  .
---------+---------+---------
 .  .  . | .  .  . | 1 .  .
 .  .  . | .  .  1 | .  .  .
 .  .  1 | .  .  . | .  .  .
Wolfgang
 
Posts: 208
Joined: 22 June 2005


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